Scattered thunderstorms developed in Missouri during the morning of May 31st. As they passed through central Missouri, one cell was able to produce minor flooding in Boone and Moniteau counties.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LSX wrote it up.
Scattered thunderstorms developed in Missouri during the morning of May 31st. As they passed through central Missouri, one cell was able to produce minor flooding in Boone and Moniteau counties. The thunderstorms then congealed before producing a swath of wind damage in southeast Missouri.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before the first event at May 31, 11:29 AM CST, 1 minute earlier. Its key messages:
Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 1229 PM CDT Sun May 31 2026 .KEY MESSAGES... - There will be several chances of showers and thunderstorms through tomorrow with a low chance of severe thunderstorms capable of producing large hail and damaging winds. - Dry weather is forecast Tuesday through Thursday along with near normal temperatures. && .SHORT TERM... (Through Late Monday Afternoon) Issued at 418 AM CDT Sun May 31 2026 Patchy fog has developed over parts of the area like yesterday morning with varying visibilities. With light winds and yesterday's rainfall, visibilities have fallen as low as 1/4 mile so far at SUS and CPS, but have since climbed back up to 10 miles. With the clouds overhead and the relatively short night, I suspect any dense fog will stay patchy the rest of the night. There will the potential for several rounds of showers and thunderstorms to move across parts of the CWA through Monday. There remains a strong CAPE gradient that is expected to remain in place from west to east in addition to the persistent low level convergence axis. Showers and thunderstorms currently over western Missouri are slowly moving east, and may move into central Missouri early this morning. An upper trough over the central Plains will lift northeast this morning and supply decent ascent over the area this afternoon. The CAMS are showing an increase in convection over the area by mid afternoon into this evening, though they are inconsistent with their timing and location. This is likely because there will be an upper ridge building over Missouri and Illinois today causing weak steering currents. The CAMS are also showing some redevelopment of the thunderstorms over northern Missouri this evening that will move into the CWA overnight. Both of these rounds will have some potential of isolated severe thunderstorms in the SPC marginal risk with up to 1" hail and 60 mph winds, though the coverages an severity of storms will be dependent on the previous rounds of storms. There will also be the potential for heavy rainfall to produce localized flooding, particularly over central and southeast Missouri where PWATS will be around 1.8" with warm cloud depths over 10k feet. The CAMS are showing the second round of convection exiting the CWA by 12Z on Monday. Both the RAP/GFS is showing a front lingering back across central and southeast Missouri during the day with sufficient CAP/shear to bring the risk of an isolated strong to severe thunderstorm. Britt && .LONG TERM... (Monday Night through Saturday) Issued at 418 AM CDT Sun May 31 2026 Model guidance is consistent showing an upper high moving south across Midwest Tuesday into Thursday resulting in dry weather across the CWA during this period. The chance for showers and thunderstorms will return beginning on Thursday night and continues into Saturday when moisture return will increase ahead of upper low over the Plains. The LREF is showing 40-60% of its members producing rain over the CWA by Saturday. WHile temperatures may cool down to around 80 on Tuesday and Wednesday, highs are forecast to be mainly in 80s this week as they climb back into the upper 80s by Friday and Saturday. Britt && .AVIATION... (For the 18z TAFs through 18z Monday Afternoon) Issued at 1224 PM CDT Sun May 31 2026 An area of showers/weak thunderstorms to the west of the metro terminals is expected to slide south and weaken with time/eastward extent. Much of the afternoon/early evening may tend to be dry across the area, but more widespread showers and thunderstorms are expected overnight tonight into the early morning hours on Monday. While confidence in details (timing, longevity, areas impacted) is not very high, it does look like KCOU/KJEF have the best chance of seeing the greatest impacts. This is where the storms may be a bit stronger, so expect IFR visibilities in heavier cores and possibly some small hail/gusty winds as well. The thunderstorms should move out from west/northwest to east/southeast with time, leaving dry conditions behind it for much of the area Monday morning. Gosselin && .LSX WATCHES/WARNINGS/ADVISORIES... MO...None. IL...None. && WFO LSX
The Pleasant Hill radar (KEAX), 140 km away, was scanning. The volume nearest the first event began at 17:30 UTC.
2 flood, 2 thunderstorm wind. Local standard time, as filed.
Heavy rain resulted in moving water about 3 inches deep along the road near Mt. Moriah Baptist Church in Clarksburg.
Highway 40 near Cunningham Drive in Columbia was closed due to water over the roadway.
Thunderstorm winds estimated to be about 60 mph in magnitude downed large, healthy trees around St. Francois county. One large branch fell onto a metal outdoor pool, bending its frame in Doe Run.
Thunderstorm winds estimated to be about 60 mph in magnitude downed large, healthy branches in and near Fredericktown. Some fell on a residence and damaged its gutters and roof, though the true extent of the damage is unknown. Other large trees and power lines were downed through the county. Notably, winds caused extensive damage across a farmstead near Junction City. A farm outbuilding was collapsed, and a wooden beam was drilled into the top of a garage. Debris was all over the yard, including atop a GMC Denali and Buick crossover. The debris did damage both vehicles.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2026Every state in 2026This day in weather historyWarnings in Missouri, May 2026
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1334144, 1334145, 1334138, 1334143.